Ticket #9003: 9003.diff

wp-includes/comment.php

@@ -739 +739 @@
         if ( ! $wpdb->query( $wpdb->prepare("DELETE FROM $wpdb->comments WHERE comment_ID = %d LIMIT 1", $comment_id) ) )
                 return false;
 
+        $wpdb->update($wpdb->comments, array('comment_parent' => $comment->comment_parent), array('comment_parent' => $comment_id));
+
         $post_id = $comment->comment_post_ID;
         if ( $post_id && $comment->comment_approved == 1 )
                 wp_update_comment_count($post_id);